How to Add Number Rows to a grid view dynamically using c# asp.net
Add new "rows" to the datasource of the grid. If your datasource is a DataTable, then add a new DataRow to the DataTable. If your datasource is a collection of objects, then add a new object to that collection.
Don't forget to rebind the grid once you have updated the datasource.
To do this, add rows to the data source to which the grid is bound.
Here's an example.
Edit: The link I posted adds a row without adding to the data source. It seems kind of kludgey to me, but it may be more like what you're looking for.
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i want to add row at top of the Telerik Grid. i bound Data in that grid. i want dummy row with DB Binding value. it tried the following but it doesn't work
radGridView1.Rows.AddNew();
radGridView1.Rows.Add("***********************","******");
this.purchase_DetailsTableAdapter.Fill(dt); //data binding
Please try this Telerik documentation link: Adding and Inserting Rows in RadGridView control. After adding new row to the RadGridView, you may try to rebind the RadGridView. See this link: RadGridView data rebind.
I'm adding a great deal of rows to a data grid view, and the process is pretty slow because it appears to try to redraw after each addition.
I'm having trouble finding an example online of how to create a List (or array, whichever works) of rows and add them all at once after the list is created. I need to do this to stop it from re-drawing after each addition though.
Can anyone provide a brief example of this or point me to a good doc?
You're probably looking for the DataGridView.DataSource property. See http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.datasource(v=vs.90).aspx
For example:
//Set up the DataGridView either via code behind or the designer
DataGridView dgView = new DataGridView();
//You should turn off auto generation of columns unless you want all columns of
//your bound objects to generate columns in the grid
dgView.AutoGenerateColumns = false;
//Either in the code behind or via the designer you will need to set up the data
//binding for the columns using the DataGridViewColumn.DataPropertyName property.
DataGridViewColumn column = new DataGridViewColumn();
column.DataPropertyName = "PropertyName"; //Where you are binding Foo.PropertyName
dgView.Columns.Add(column);
//You can bind a List<Foo> as well, but if you later add new Foos to the list
//reference they won't be updated in the grid. If you use a binding list, they
//will be.
BindingList<Foo> listOfFoos = Repository.GetFoos();
dgView.DataSource = listOfFoos;
A handy event to bind to at that point is the DataGridView.DataBindingComplete which fires after the data source is bound.
Here are a couple of ideas:
1) Bind a list to the DataGridView. When you set the DataGridView.DataSource = MyList, it immediately updates the entire grid without all the line-by-line action. You can add the items to MyList and then rebind to the DataGridView. (I prefer using a BindingList which will update the DataGridView grid dynamically.)
2) If data binding is not an option, what I've done in the past is set the AutoSizeMode = NotSet for each column before the update and then set it back to whatever it was before. It is the AutoSizeMode that really slows down the drawing.
I'm trying to get a list of rows deleted by pressing the '-' button in a Devexpress Grid widget as depicted here.
However, doing the following does not return any results
DataView delrows = new DataView(myTableAdapter.DataView.Table);
delrows.RowStateFilter = DataViewRowState.Deleted;
What am I doing wrong?
edit: Filtering on Added and Modified rows works fine.
instead of doing as you do now try this:
myTableAdapter.DataView.RowStateFilter = DataViewRowState.Deleted;
of course it's not easy to guess without knowing better your data binding architecture...
Considering that your DevExpress grid is binded to a DataTable (either with or without a DataView):
You can retrieve the deleted rows by using the Select() method of the DataTable. This is not a linq method.
table.Select(null, null, DataViewRowState.Deleted);
The rest of the rows can be retrieved by using
table.Select(null, null, DataViewRowState.CurrentRows);
Just be aware that a row that is added then deleted will not have the deleted flag, but will instead be removed from the rows collection. Such rows would also have a RowState of Detached.
Howdy, using vs2008 winforms.
I want to be able to use a slightly customised datagridview but cant think of a way to do it.
i have
1. a sqldataadaptor fill a dataset
2. a binding source bound to the dataset
3 a datagridview with the bindingsource set as the datasource.
I want the binding to allow sync between the dataset and datagridview, so i can edit data and then update to database with sqldataadaptor. update.
I want to show some custom columns that are calculated results.
And i want to show a final bottom row that is totals of all the columns in the DVG.
My problem is once the DGV is bound i cant add a custom column or row, it wont let me.
I know i could add it directly to the dataset that is the underlying datasource but then by changing the structure of the dataset i cant update to a database once edits have taken place.
or can i ???
Can someone tell me how i can add my custom columns and a final total row to a bound DGV.
Also while im here, if i click on the top of a column to sort on it, in a bound DGV, will it also re-sort the underlying dataset, so i i edit things will still stay synced ?
thanks in advance for any help
Yes, you can.
The adapter does not care about structure. It only cares about column names used in the Select/Insert/Update/Delete commands. You can add custom columns, expression columns, columns for subtotals, columns for totals, or whatever you need. Even change the order of the columns. I do advise adding a sort column, so you can keep the custom rows in the proper place when you or the user sorts.
You can do the same thing for custom rows. When you update through the adapter, you handle the RowUpdating event and set the SqlRowUpdatingEventArgs.Status to SkipCurrentRow for these custom rows. I strongly advise creating a row type column so you know which rows to skip when updating. (You can also use the sort column's value as a key to skip rows.)
There are a couple of articles on MSDN or KB that illustrate how to add total rows.
"How to sum the fields in a Windows Forms DataGrid control and then display the calculated totals in a footer by using Visual Basic .NET" at http://support.microsoft.com/kb/836672.
In my experience, manipulate the data table first before binding. Do what you need to do in order to support the grid and the grid's interface. It is okay to manipulate the data, add/change/remove columns and rows, then rebind when needed.
To be able to add additional unbound columns to your DataGridView you could also set its AutoGenerateColumns property to false and then add custom columns with the following method:
dataGridView->Columns->Add(...)
To calculate the contents of the unbound columns you can handle the CellValueNeeded and CellValuePushed events but you must set the DataGridView into 'virtual mode' by setting the VirtualMode property to true in order for the eventhandlers to be invoked.
Hope this helps a little....
i want to insert a new row to grid view while i click new button with out using the sqldatasource. and also how to edit, update, and delete rows from grid view. pls help me
[visual studio 2008
asp.net with c#]
thanks
thiru
What do you mean by "without using the SqlDataSource" ? How do you intend to propagate the inserted data to the data store, then ? You have not specified what other method you are using.
Anyway, the GridView does not inherently support insertion of records, but you can accomplish it by creating a FooterTemplate in which you create the fields for entry of new data. Additionally, provide a column to allow for Insert/Cancel buttons in the FooterTemplate.
Here's a good sample: How to easily insert row in GridView with SqlDataSource
Good gridview tutorial : ASP.NET Quickstart Tutorials
For adding new row you could try putting controls in footer row of the GridView.
Editing, updating and deleting require you to do two things:
implement those operations in the SqlDataSource
enable these operations in GridView
If you want to do it without the SQL datasource, then set DataTable as a GridView's datasource.
Good example on how to populate and add a row to datatable.